一些人认为最有用的发明之一是智能手机。
Some people think one of the most useful inventions is the smartphone.
手机是过去50年里最有用的发明之一，但并不是所有关于它们的说法都是正面的。
Mobile phones are one of the most useful inventions of the last 50 years, but not everything that is said about them is good.
灯泡是最有用的发明之一。
塑料袋被认为是第二十世纪最有用的发明，我国在过去的几年里就开始的一次性使用品。
Plastic bag was once called as the most useful invention in the 20th century and it was disposable in our country in the past few years.
电话电话是目前最受欢迎和最有用的发明之一，怪不得越来越多的人已经使用了自己的电话。
The telephone the telephone is one of the most welcome and useful inventions. No wonder more and more families have got to use their own telephones today.
电话电话是目前最受欢迎和最有用的发明之一，怪不得越来越多的人已经使用了自己的电话。
The TelephoneThe telephone is one of the most welcome and useful inventions. No wonder more and more families have got to use their own telephones today.
电话电话是目前最受欢迎和最有用的发明之一，怪不得越来越多的人已经使用了自己的电话。
The TelephoneThe telephone is one of the most welcome and useful inventions. No wonder more and more families have got to use their own telephones today.
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